Chance of rain, maybe even thunderstorms, in the weekend weather forecast

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The San Francisco Bay Area is in the midst of a pleasant spell of sunny weather, but all of this is forecast to change over the weekend.

Temperatures on Thursday will be seasonably warm with high-60s on the coast and 70s inland.

Friday may see some morning fog but afternoon temperatures will be similar. Earlier in the week, the National Weather service had said some inland spots might hit the 80s on Friday, but the forecast has since shifted to high-70s.

All of this nice weather will come to a halt on Saturday as an upper-level storm system approaches from the west, pushing daytime temperatures down several degrees.

"This system will also bring an increase in cloud cover and potential for isolated to scattered showers over the region from Sunday through early next week," according to the National Weather Service office in Monterey. "Isolated thunderstorms cannot be ruled out at this point and may eventually be added to the forecast as confidence increases."

While thunderstorms are a slight possibility, the NWS says in the middle of spring, "these types ofsystems this time of year generally do not produce widespread heavy rainfall."